The magpul acs-l (adaptable carbine stock - light) is a drop-in replacement buttstock for ar15/m4 carbines using mil-spec sized receiver extension tubes.A streamlined version of the acs the acs-l utilizes the same center storage compartment and cheek weld but removes the battery tubes for a slimmer lighter weight package.Firearm Type: AR-15Firearm Model: AR-15Material: Reinforced PolymerFinish: GrayFeatures: Integral Storage CompartmentAdjustment Type: CollapsiblePositions: 6Length Of Pull: 11.60"-14.90"Tube Included: No